The HP/Agilent 8444A Tracking Generator is a synthesized, frequency-tracking signal source engineered to complement spectrum analyzers including the 8554B and 8555A. It delivers leveled, calibrated RF output across a wide frequency range, enabling swept frequency measurements and direct frequency response characterization of filters, amplifiers, and network components.
## Technical Specifications
**Frequency Coverage**
• 0.5 MHz to 1.3 GHz (standard)
• 0.5 MHz to 1.5 GHz (with Option 059)
• Frequency resolution: 1 kHz
**Output Characteristics**
• Continuously variable output level: 0 dBm to −10 dBm
• Amplitude accuracy: ±0.5 dB (0.5 to 1300 MHz); ±0.75 dB (0.5 to 1500 MHz)
• Tracking generator calibration: 0 dBm ±0.5 dB at 30 MHz
• System frequency response: ±2.7 dB
• Dynamic range: >90 dB
**Spectral Purity**
• Spurious signals: ≥35 dB below output level
• Harmonic distortion: 25 dB below output level (typical)
• Residual FM noise (peak-to-peak): 200 Hz (stabilized); <10 kHz (unstabilized)
**Interfaces**
• Output connector: Type N female
• Counter output: 0.1 V rms (typical)
• 500 MHz third LO output: Available with Option 059
**Physical**
• Weight (with Option 059): 7.1 kg (15.6 lb)
## Key Features
• Phase-locked synthesis for precise frequency tracking
• Leveled output maintains constant amplitude across swept frequency range
• Greater than 90 dB dynamic range from 1 dB gain compression to noise floor
• Residual FM noise stabilization reduces measurement uncertainty
## Typical Applications
• Filter and amplifier frequency response measurement
• Network component characterization
• Swept frequency analysis of RF/microwave circuits
• Direct gain/loss measurements on two-port networks
## Compatibility & Integration
The 8444A integrates with HP/Agilent spectrum analyzers including the 8554B, 8555A, 8590A/B, 8568A/B, and 8558B. When paired with the 8555A, frequency coverage extends to 18 GHz via internal mixer configuration.
